FM 31-15 Operations Against Irregular Forces 1961-05-31
"The text discusses the nature of irregular forces comprised of organized guerrilla units and underground elements, and their supporters; and the organization, training, tactics, techniques, and procedures to be employed by a combined arms force, normally in conjunction with civil agencies, to destroy large, well-organized irregular forces in active or cold war situations."
Digitized by the Combined Arms Research Library Digital Library, US Army Combined Arms Center. http://cgsc.cdmhost.com/cdm/